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Alt · 1 month ago

Senior Fullstack Engineer, Frontend

United States

Full-time

Remote

Senior Level

$140K/yr - $160K/yr

5+ years exp

Alt is a company focused on unlocking the value of alternative assets, particularly in the trading-card market. They are seeking a Senior Fullstack Engineer, Frontend with deep React Native expertise to own their flagship mobile experience and contribute to the architecture and performance of the app.

FinanceFinancial ServicesFinTechLendingMarketplace

Responsibilities

Own Alt’s flagship mobile application our most important user-facing product

Lead the React Native platform across build systems, deployments (store and OTA), CI/CD, performance, reliability, and developer experience

Work across multiple product domains:Auctions, Search, Payments, Lending, Notifications, Authentication, Fixed Price Marketplace and more

Build seamless, highly performant UIs that make a React Native app feel truly native

Work with the native layers (iOS & Android), bridging JavaScript and native code where needed

Partner closely with product, design, and business to influence what we build—not just how we build it

Mentor, level up, and provide architectural guidance to other engineers

Help us scale a global frontend/mobile team; grow into management over time if desired

Contribute to backend systems as needed (Python/FastAPI/Postgres, 30% of role)

Qualification

React NativeIOS/Android developmentJavaScript/TypeScriptPython/FastAPI/PostgresProduct mindsetMentoringCollaborationProblem-solving

Required

5-7 years of professional experience building production React Native apps at scale

Experience shipping and maintaining ejected React Native applications

Ability to work with native iOS/Android code (Kotlin, Java, Swift, and Objective C), JavaScript/TypeScript, and build high-quality bridges between them

A strong product mindset: our engineers are highly product-focused and expected to have real influence

Experience making React Native apps feel extremely polished, smooth, and native

Motivation to tackle hard engineering challenges across performance, architecture, and mobile infrastructure

Ability to work collaboratively in a fast-paced startup environment